Thanks, Liza with a Z! It wasn't actually by chance that I looked out the window. I wasfascinated with the window view the whole time (that is, the whole time while there was still daylight). Spectacular experience!

Yeah, I know. The colors look more like a Photoshopped gradient map product than something produced in nature. But they're real - the slanting late-day sunlight is yellow on the hills and that cyan blue is shadow on the snow in the hollows. I really lucked out on this flight, photography-wise. And the experience of seeing all that was something I'll have with me for the rest of my life.

Nope, not water. It's landscape with a series of small hills in a pattern. There's snow in the hollows, and being late in the day, it's a bluish tone from the light & shadow. Thanks, all, for commenting!